Crank-handle latch



E. E. PHINNEY.

CRANK HANDLE LATCH.

APPLICATIONEILED MAR.15. 1920.

Patented Nov. 8, 1921.

UNITED STATES PATENT OFFICE.

EDGAE E PHINNEY, or WEST oEANGE, NEW JERSEY, AssIGNoE 'ro MoNEo-E cAIcU-LATING MACHINE COMPANY, or ORANGE, NEW JERSEY, A conroaArroN or NEWYORK.

CRAN K-HAN DLE LATCH.

Specification of Letters latent.

Application led March 15, 1920. Serial No. 365,971.

following to be a full, clear, and'exact de` scription of the same, suchas will enable `others skilled in the art to which it appertains to makeand use the invention, refer-VV ence being had to the accompanyingdrawings, and to letters or figures of reference marked thereon, whichform a part of this specification. .J

Figure 1 is a front view of the left-hand end of a calculating machineembodying the invention, with parts in section.

Fig. 2 isa detail side View of the latch, the disengaged positionthereof being shown in dotted lines. s

Fig. 3 is a'detail elevation of the crank handle.

Fig. 4 is a detail fragmentary view of the latch lever and the slottedportion of the crank handle extension.

The invention has relation to means for detachably retaining anoperating crank handle of a machine in enga ement with a gear wheel ormember driven y saidhandle, and is shown as applied to a calculatingmachine of the general type of the reissue pat ent to Baldwin No.13,841, although obviously useful in other machines.

An object of the invention is to provide a readily releasable andengageable handle retaining means. Other. ob]ects and advantages willappear. l

The invention consists in the novel construction and combinations ofparts, as here inafter set forth.

In the accompanying drawings, illustrating the invention, the side frameplate 1 of the machine is provided with a lateral tubular or sleeveextension 10, whereon is journaled the gear wheel 76, forming part ofthe operating gear train of the machlne, the operating crank handle 3being provided with a short stud shaft extension 79, ro- Vtatably andslidably engaging the bore' of said sleeve, yand with a stud or pinextension 11, engaging a seat or recess 12 in the gear wheel 76, andwhereby said gear wheel 1s driven.

A latch lever 13 is fulcrumed at 19, intermediately of its length, toframe l, the lower arm. ofv said lever being provided with asemicircular recess 20, the marginal edge of which normally'engages anannular groove 15, 4located at the inner end of the extension 7 92 toprevent removal 0f the crank handle, being held from frictionalengagement or contact with the inner circumferential wall of said grooveby engagement of the termlnal end of said arm with a stop pin 18.

The up er arm of the latch lever projects through t e top plate 103 ofthe machine at 17, and is capable of operation by pressure of one lingerwhen the crank handle is grasped for removal or for rengagement with themachine. In removing the crank handle, the latch lever is operated andassumes the position shown in dotted lines in Fig. 2 of the drawings,the upper arm 17 thereof working in a slot of said top plate. Inrengaging the handle with the machine the latch lever is similarlyoperated.

The latch lever is provlded with a spring 16, normally holding it inengagement with the groove of the stud shaft extension of the handle 3,and the operation of said lever is a ainst the tension of said spring.

hen the handle 3 is in position, the outer vertical wall of the groove15 lies flush with the inner end of the sleeve 10, so that any strain uon the latch, through outward movement o the shaft 79, will be taken upby the sleeve.

I claim 1. In a device of the character described, a machine having astationary sleeve, a ro` tary driving member journaled upon said sleeve,an operating handle having driving engagement with said member androvided with a stud shaft rotatably and sli ably engaging the bore ofsaid sleeve and provided at its inner end with an annular groove, and aretaining lever operable ina plane at right angles with the axis of saidstud shaft and engaging said groove.

2. In a device of the character described, a machine havinga stationarysleeve, a rotary driving member journaled 4upon said sleeve, anoperating handle havingdriving engagement with said member and rovidedwith a stud shaft rotatably and sli ably engaging the boreY of saidsleeve and provided at its inner end with an annular groove,

'Patented Nov. 8, 1921.

, and a manually operable retaining lever engaging said groove andhaving bracing engagement with the end of said sleeve.

3. In a device of the character described, a machine having a stationrysleeve, a rotary driving member journaled upon said sleeve, an operatinghandle having driving engagement with sa'idmember and provided with astud shaft rotatably and slidably engaging the bore of said sleeve,spring acting retaining means having releasable engagement wlth saidstud shaft, and means for limiting the throw of said retaining means torelieve the shaft of spring pressure.

4. In a device of the character described, a machine having a stationarysleeve, a rotary driving member journaled upon said sleeve, an operatinghandle having driving engagement with said member and provided with astud shaft rotatably and slidably engaging the bore of said sleeve andprovided with an annular groove, a manually operable' spring retaininglever engagin said groove, and a stop, said lever belng a apted forengagement with said stop to avoid contact wlth the inner wall of saidgroove.

In testimony whereof I aiiix my signature in presence of two witnesses.

EDGAR E. PHINNEY.

Witnesses:

L. D. TAGGART, E. F. BRI'rrEN, Jr.

